Table 3. Significant correlations between the SWJ amplitude and areas with reduced brain volumes in PSP and PD patients.

	SWJ recording condition	Side	Area	MNI			Cluster size	t
				x	y	z
PSP	Target on	Left	Middle cingulate gyrus	−14	−36	51	59	8.45
		Left	Middle frontal gyrus	−26	20	42	19	7.95
		Right	Superior temporal gyrus	56	−17	−3	34	7.82
	Target off	Left	Cerebellum crus I	−17	−81	−20	56	18.94
		Right	Superior temporal gyrus	53	−42	24	18	11.07
		Right	Postcentral gyrus	21	−41	69	23	9.29
		Left	Precuneus	−15	−48	57	44	9.16
PD	Target on	Left	Middle cingulate gyrus	−9	−32	50	30	10.36
		Right	Inferior temporal gyrus	48	−65	−3	99	10.20
		Right	Superior medial frontal gyrus	9	59	11	85	7.44
		Left	Lingual gyrus/fusiform	−27	−66	−3	141	6.89
	Target off	Left	Superior temporal gyrus	−56	−9	0	79	10.48
		Right	Inferior temporal gyrus/fusiform	44	−24	−24	40	6.13

p<0.001.

MNI: coordinates according to the Montreal Neurological Institute brain atlas, PD: Parkinson's disease, PSP: progressive supranuclear palsy, SWJ: square-wave jerk.